Posted 09 September 2005 - 08:50 AM
Posted 09 September 2005 - 09:12 AM
I believe you would connect 5 volts from the LabJack to the red wire. Then connect the black wire to a digital input. You would then put a resistor (perhaps 4.7k) from the digital input to GND. You should probably contact the manufacturer to confirm this.
Posted 09 September 2005 - 11:18 AM
Posted 19 September 2005 - 03:50 PM
Posted 20 September 2005 - 01:21 AM
Posted 20 September 2005 - 05:36 AM
Posted 09 October 2013 - 07:37 AM
Updated links from above:
George Risk Industries 2800 Water Sensor Switch (GRI 2800)
Hobby Boards Leaf Wetness Sensor
Control Products WS-600 Water Sensor
Floodstop Water Sensor XS-01
RioRand Water Sensor
Phantom YoYo Water Sensor
Flood Detective Pro Water Sensor
We only tested the GRI 2800, but any of these should work. Whichever one you get, use a simple DMM to measure the resistance when dry, slightly wet, and totally wet, and from those values we can help get it connected.
These all use conductivity of the water, moisture, or other liquid, to cause a change in resistance. The resistance is infinite or very high when dry, and drops due to the conductivity of the liquid. Thus pure distilled water in theory would not be detectable, until it has picked up some impurities.
Posted 13 November 2013 - 09:41 AM
Connect VS (~5 volts) to the + lead and GND to the - lead. Then use a DMM to check the voltage on the S lead when the device is dry versus wet. Let us know what you see, but presumably this will change.
Also, for a better understanding of the sensor, use the DMM to take 3 resistance measurements with no other connections to the sensor besides the DMM. Measure from + to -, + to S, and S to -. Let us know what you get for these.
Series does not make sense to me, but you can wire a bunch in parallel. Connect VS to the + lead on all and connect GND to the - lead on all. The connect the S leads to different analog or digital inputs, depending on what you find from the above test.
Posted 15 November 2013 - 02:33 AM
Thanks. I'll report back on how I get on. Might be next week now.
Posted 20 November 2013 - 08:21 AM
I got this working. Thanks for your help.
When dry, between 'S' & '-' the voltage is 0v. When It gets wet it rises to 3.2V approx.
I fed 'S' into an analogue channel on the U3 and was able to use it as a trigger in a sequence.
Thanks again for taking the time to reply.
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